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Two Modules with same Storage Name
See original GitHub issueIf two modules have the same name for their storage, only one item appears in the “chain state”.
For example:
"name": "substrate_module_template",
"prefix": "TemplateModule",
and
"name": "template",
"prefix": "TemplateModule",
Here is the full chain metadata:
{
"magicNumber": 1635018093,
"metadata": {
"MetadataV4": {
"modules": [
{
"name": "system",
"prefix": "System",
"storage": [
{
"name": "AccountNonce",
"modifier": "Default",
"type": {
"MapType": {
"hasher": "Blake2_256",
"key": "AccountId",
"value": "Index",
"isLinked": false
}
},
"fallback": "0x0000000000000000",
"documentation": [
" Extrinsics nonce for accounts."
]
},
{
"name": "ExtrinsicCount",
"modifier": "Optional",
"type": {
"PlainType": "u32"
},
"fallback": "0x00",
"documentation": [
" Total extrinsics count for the current block."
]
},
{
"name": "AllExtrinsicsLen",
"modifier": "Optional",
"type": {
"PlainType": "u32"
},
"fallback": "0x00",
"documentation": [
" Total length in bytes for all extrinsics put together, for the current block."
]
},
{
"name": "BlockHash",
"modifier": "Default",
"type": {
"MapType": {
"hasher": "Blake2_256",
"key": "BlockNumber",
"value": "Hash",
"isLinked": false
}
},
"fallback": "0x0000000000000000000000000000000000000000000000000000000000000000",
"documentation": [
" Map of block numbers to block hashes."
]
},
{
"name": "ExtrinsicData",
"modifier": "Default",
"type": {
"MapType": {
"hasher": "Blake2_256",
"key": "u32",
"value": "Bytes",
"isLinked": false
}
},
"fallback": "0x00",
"documentation": [
" Extrinsics data for the current block (maps extrinsic's index to its data)."
]
},
{
"name": "RandomSeed",
"modifier": "Default",
"type": {
"PlainType": "Hash"
},
"fallback": "0x0000000000000000000000000000000000000000000000000000000000000000",
"documentation": [
" Random seed of the current block."
]
},
{
"name": "Number",
"modifier": "Default",
"type": {
"PlainType": "BlockNumber"
},
"fallback": "0x0000000000000000",
"documentation": [
" The current block number being processed. Set by `execute_block`."
]
},
{
"name": "ParentHash",
"modifier": "Default",
"type": {
"PlainType": "Hash"
},
"fallback": "0x0000000000000000000000000000000000000000000000000000000000000000",
"documentation": [
" Hash of the previous block."
]
},
{
"name": "ExtrinsicsRoot",
"modifier": "Default",
"type": {
"PlainType": "Hash"
},
"fallback": "0x0000000000000000000000000000000000000000000000000000000000000000",
"documentation": [
" Extrinsics root of the current block, also part of the block header."
]
},
{
"name": "Digest",
"modifier": "Default",
"type": {
"PlainType": "Digest"
},
"fallback": "0x00",
"documentation": [
" Digest of the current block, also part of the block header."
]
},
{
"name": "Events",
"modifier": "Default",
"type": {
"PlainType": "Vec<EventRecord>"
},
"fallback": "0x00",
"documentation": [
" Events deposited for the current block."
]
}
],
"calls": null,
"events": [
{
"name": "ExtrinsicSuccess",
"args": [],
"documentation": [
" An extrinsic completed successfully."
]
},
{
"name": "ExtrinsicFailed",
"args": [],
"documentation": [
" An extrinsic failed."
]
}
]
},
{
"name": "timestamp",
"prefix": "Timestamp",
"storage": [
{
"name": "Now",
"modifier": "Default",
"type": {
"PlainType": "Moment"
},
"fallback": "0x0000000000000000",
"documentation": [
" Current time for the current block."
]
},
{
"name": "BlockPeriod",
"modifier": "Optional",
"type": {
"PlainType": "Moment"
},
"fallback": "0x00",
"documentation": [
" Old storage item provided for compatibility. Remove after all networks upgraded."
]
},
{
"name": "MinimumPeriod",
"modifier": "Default",
"type": {
"PlainType": "Moment"
},
"fallback": "0x0300000000000000",
"documentation": [
" The minimum period between blocks. Beware that this is different to the *expected* period",
" that the block production apparatus provides. Your chosen consensus system will generally",
" work with this to determine a sensible block time. e.g. For Aura, it will be double this",
" period on default settings."
]
},
{
"name": "DidUpdate",
"modifier": "Default",
"type": {
"PlainType": "bool"
},
"fallback": "0x00",
"documentation": [
" Did the timestamp get updated in this block?"
]
}
],
"calls": [
{
"name": "set",
"args": [
{
"name": "now",
"type": "Compact<Moment>"
}
],
"documentation": [
" Set the current time.",
"",
" This call should be invoked exactly once per block. It will panic at the finalization phase,",
" if this call hasn't been invoked by that time.",
"",
" The timestamp should be greater than the previous one by the amount specified by `minimum_period`.",
"",
" The dispatch origin for this call must be `Inherent`."
]
}
],
"events": null
},
{
"name": "consensus",
"prefix": "Consensus",
"storage": [
{
"name": "OriginalAuthorities",
"modifier": "Optional",
"type": {
"PlainType": "Vec<SessionKey>"
},
"fallback": "0x00",
"documentation": []
}
],
"calls": [
{
"name": "report_misbehavior",
"args": [
{
"name": "_report",
"type": "Bytes"
}
],
"documentation": [
" Report some misbehavior."
]
},
{
"name": "note_offline",
"args": [
{
"name": "offline",
"type": "InherentOfflineReport"
}
],
"documentation": [
" Note that the previous block's validator missed its opportunity to propose a block."
]
},
{
"name": "remark",
"args": [
{
"name": "_remark",
"type": "Bytes"
}
],
"documentation": [
" Make some on-chain remark."
]
},
{
"name": "set_heap_pages",
"args": [
{
"name": "pages",
"type": "u64"
}
],
"documentation": [
" Set the number of pages in the WebAssembly environment's heap."
]
},
{
"name": "set_code",
"args": [
{
"name": "new",
"type": "Bytes"
}
],
"documentation": [
" Set the new code."
]
},
{
"name": "set_storage",
"args": [
{
"name": "items",
"type": "Vec<KeyValue>"
}
],
"documentation": [
" Set some items of storage."
]
},
{
"name": "kill_storage",
"args": [
{
"name": "keys",
"type": "Vec<Key>"
}
],
"documentation": [
" Kill some items from storage."
]
}
],
"events": null
},
{
"name": "aura",
"prefix": "",
"storage": null,
"calls": null,
"events": null
},
{
"name": "indices",
"prefix": "Indices",
"storage": [
{
"name": "NextEnumSet",
"modifier": "Default",
"type": {
"PlainType": "AccountIndex"
},
"fallback": "0x00000000",
"documentation": [
" The next free enumeration set."
]
},
{
"name": "EnumSet",
"modifier": "Default",
"type": {
"MapType": {
"hasher": "Blake2_256",
"key": "AccountIndex",
"value": "Vec<AccountId>",
"isLinked": false
}
},
"fallback": "0x00",
"documentation": [
" The enumeration sets."
]
}
],
"calls": [],
"events": [
{
"name": "NewAccountIndex",
"args": [
"AccountId",
"AccountIndex"
],
"documentation": [
" A new account index was assigned.",
"",
" This event is not triggered when an existing index is reassigned",
" to another `AccountId`."
]
}
]
},
{
"name": "balances",
"prefix": "Balances",
"storage": [
{
"name": "TotalIssuance",
"modifier": "Default",
"type": {
"PlainType": "Balance"
},
"fallback": "0x00000000000000000000000000000000",
"documentation": [
" The total units issued in the system."
]
},
{
"name": "ExistentialDeposit",
"modifier": "Default",
"type": {
"PlainType": "Balance"
},
"fallback": "0x00000000000000000000000000000000",
"documentation": [
" The minimum amount required to keep an account open."
]
},
{
"name": "TransferFee",
"modifier": "Default",
"type": {
"PlainType": "Balance"
},
"fallback": "0x00000000000000000000000000000000",
"documentation": [
" The fee required to make a transfer."
]
},
{
"name": "CreationFee",
"modifier": "Default",
"type": {
"PlainType": "Balance"
},
"fallback": "0x00000000000000000000000000000000",
"documentation": [
" The fee required to create an account."
]
},
{
"name": "TransactionBaseFee",
"modifier": "Default",
"type": {
"PlainType": "Balance"
},
"fallback": "0x00000000000000000000000000000000",
"documentation": [
" The fee to be paid for making a transaction; the base."
]
},
{
"name": "TransactionByteFee",
"modifier": "Default",
"type": {
"PlainType": "Balance"
},
"fallback": "0x00000000000000000000000000000000",
"documentation": [
" The fee to be paid for making a transaction; the per-byte portion."
]
},
{
"name": "Vesting",
"modifier": "Optional",
"type": {
"MapType": {
"hasher": "Blake2_256",
"key": "AccountId",
"value": "VestingSchedule",
"isLinked": false
}
},
"fallback": "0x00",
"documentation": [
" Information regarding the vesting of a given account."
]
},
{
"name": "FreeBalance",
"modifier": "Default",
"type": {
"MapType": {
"hasher": "Blake2_256",
"key": "AccountId",
"value": "Balance",
"isLinked": false
}
},
"fallback": "0x00000000000000000000000000000000",
"documentation": [
" The 'free' balance of a given account.",
"",
" This is the only balance that matters in terms of most operations on tokens. It",
" alone is used to determine the balance when in the contract execution environment. When this",
" balance falls below the value of `ExistentialDeposit`, then the 'current account' is",
" deleted: specifically `FreeBalance`. Further, the `OnFreeBalanceZero` callback",
" is invoked, giving a chance to external modules to clean up data associated with",
" the deleted account.",
"",
" `system::AccountNonce` is also deleted if `ReservedBalance` is also zero (it also gets",
" collapsed to zero if it ever becomes less than `ExistentialDeposit`."
]
},
{
"name": "ReservedBalance",
"modifier": "Default",
"type": {
"MapType": {
"hasher": "Blake2_256",
"key": "AccountId",
"value": "Balance",
"isLinked": false
}
},
"fallback": "0x00000000000000000000000000000000",
"documentation": [
" The amount of the balance of a given account that is externally reserved; this can still get",
" slashed, but gets slashed last of all.",
"",
" This balance is a 'reserve' balance that other subsystems use in order to set aside tokens",
" that are still 'owned' by the account holder, but which are suspendable.",
"",
" When this balance falls below the value of `ExistentialDeposit`, then this 'reserve account'",
" is deleted: specifically, `ReservedBalance`.",
"",
" `system::AccountNonce` is also deleted if `FreeBalance` is also zero (it also gets",
" collapsed to zero if it ever becomes less than `ExistentialDeposit`.)"
]
},
{
"name": "Locks",
"modifier": "Default",
"type": {
"MapType": {
"hasher": "Blake2_256",
"key": "AccountId",
"value": "Vec<BalanceLock>",
"isLinked": false
}
},
"fallback": "0x00",
"documentation": [
" Any liquidity locks on some account balances."
]
}
],
"calls": [
{
"name": "transfer",
"args": [
{
"name": "dest",
"type": "Address"
},
{
"name": "value",
"type": "Compact<Balance>"
}
],
"documentation": [
" Transfer some liquid free balance to another account.",
"",
" `transfer` will set the `FreeBalance` of the sender and receiver.",
" It will decrease the total issuance of the system by the `TransferFee`.",
" If the sender's account is below the existential deposit as a result",
" of the transfer, the account will be reaped.",
"",
" The dispatch origin for this call must be `Signed` by the transactor."
]
},
{
"name": "set_balance",
"args": [
{
"name": "who",
"type": "Address"
},
{
"name": "free",
"type": "Compact<Balance>"
},
{
"name": "reserved",
"type": "Compact<Balance>"
}
],
"documentation": [
" Set the balances of a given account.",
"",
" This will alter `FreeBalance` and `ReservedBalance` in storage.",
" If the new free or reserved balance is below the existential deposit,",
" it will also decrease the total issuance of the system (`TotalIssuance`)",
" and reset the account nonce (`system::AccountNonce`).",
"",
" The dispatch origin for this call is `root`."
]
}
],
"events": [
{
"name": "NewAccount",
"args": [
"AccountId",
"Balance"
],
"documentation": [
" A new account was created."
]
},
{
"name": "ReapedAccount",
"args": [
"AccountId"
],
"documentation": [
" An account was reaped."
]
},
{
"name": "Transfer",
"args": [
"AccountId",
"AccountId",
"Balance",
"Balance"
],
"documentation": [
" Transfer succeeded (from, to, value, fees)."
]
}
]
},
{
"name": "sudo",
"prefix": "Sudo",
"storage": [
{
"name": "Key",
"modifier": "Default",
"type": {
"PlainType": "AccountId"
},
"fallback": "0x0000000000000000000000000000000000000000000000000000000000000000",
"documentation": [
" The `AccountId` of the sudo key."
]
}
],
"calls": [
{
"name": "sudo",
"args": [
{
"name": "proposal",
"type": "Proposal"
}
],
"documentation": [
" Authenticates the sudo key and dispatches a function call with `Root` origin.",
"",
" The dispatch origin for this call must be _Signed_."
]
},
{
"name": "set_key",
"args": [
{
"name": "new",
"type": "Address"
}
],
"documentation": [
" Authenticates the current sudo key and sets the given AccountId (`new`) as the new sudo key.",
"",
" The dispatch origin for this call must be _Signed_."
]
}
],
"events": [
{
"name": "Sudid",
"args": [
"bool"
],
"documentation": [
" A sudo just took place."
]
},
{
"name": "KeyChanged",
"args": [
"AccountId"
],
"documentation": [
" The sudoer just switched identity; the old key is supplied."
]
}
]
},
{
"name": "template",
"prefix": "TemplateModule",
"storage": [
{
"name": "Something",
"modifier": "Optional",
"type": {
"PlainType": "u32"
},
"fallback": "0x00",
"documentation": []
}
],
"calls": [
{
"name": "do_something",
"args": [
{
"name": "something",
"type": "u32"
}
],
"documentation": []
}
],
"events": [
{
"name": "SomethingStored",
"args": [
"u32",
"AccountId"
],
"documentation": []
}
]
},
{
"name": "substrate_module_template",
"prefix": "TemplateModule",
"storage": [
{
"name": "Something",
"modifier": "Optional",
"type": {
"PlainType": "u32"
},
"fallback": "0x00",
"documentation": []
}
],
"calls": [
{
"name": "do_something",
"args": [
{
"name": "something",
"type": "u32"
}
],
"documentation": []
}
],
"events": [
{
"name": "SomethingStored",
"args": [
"u32",
"AccountId"
],
"documentation": []
}
]
}
]
}
}
}
Issue Analytics
- State:
- Created 4 years ago
- Comments:12 (11 by maintainers)
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Pick same name: -> should be forbidden. Pick same prefix: -> no problem.
Not sure what happens now if you create 2 modules with the same name, but imo that should be forbidden in substrate.
Ok, the issue is - what is valid? The first item of a specific storage? The second? Which rules apply? As it stands the API needs to make assumptions as to which to take - it currently already makes an assumption - the second module as a whole is valid, overriding the first.
So certainly, different assumptions can be made - but it is just that, assumptions of developer intent. Since you can override calls, entries, anything - which is valid in which cases. (Since even at the base of substrate there are conflicts, e.g. storage due to
hash(<ModuleName> <EntryName>))It is not a UI thing, the UI only displays what the API provides it.